drm/i915: Preallocate the debug power domain wakerefs array

Since the current size of intel_display_power_domain_set struct is
close to 1kB, it's better to use preallocated memory for it. The only
user of the intel_display_power_get/put_in_set() allocating the struct
on stack is hsw_get_pipe_config(), so we can avoid potential stack
overallocations by moving the struct here to the preallocated
intel_crtc struct (hsw_get_pipe_config() is non-reentrant wrt. each
CRTC).

This patch replaces
https://lore.kernel.org/intel-gfx/[email protected]/T/#md3f6cdf17fcd

Suggested-by: Ville Syrjälä <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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